Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
Author | |
Keywords | |
Abstract |
An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe, where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe. Here we present a novel nonlinear mechanism for the formation of these gaps using Hamiltonian theory and test particle simulations in a homogeneous, magnetized, collisionless plasma. We find that an oblique whistler wave with frequency at a fraction of the electron cyclotron frequency can resonate with electrons, leading to effective energy exchange between the wave and particles.
|
Year of Publication |
2015
|
Journal |
Geophysical Research Letters
|
Date Published |
05/2015
|
URL |
http://doi.wiley.com/10.1002/2015GL064182
|
DOI |
10.1002/2015GL064182
|
Download citation |